Solar Panel Cost in Arizona: $2.21/W, 16.9-Year Payback

Solar in Arizona costs about $17,680 for 8 kW at $2.21/W and pays back in roughly 16.9 years at 15.4¢/kWh with the federal credit at $0.

Updated September 2026 · Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23

By SolarCostData Data Desk · Reviewed September 2026 · Corrections log

On this page: CalculatorTableHow we calculatedSources

Jump to calculator ↓

Why this number

Solar panels in Arizona cost about $2.21 per watt — $17,680 for a typical 8 kW system — and pay back in roughly 16.9 years at the state’s 15.4¢/kWh average rate, with the 2026 federal credit at $0. Net billing pays exports below retail here.

Everything below uses Arizona’s real average residential electricity rate (15.4¢/kWh, EIA) and a production band of about 1,685 kWh per kW per year. Both are stated openly because they are the two inputs that decide the answer. These are estimates for sanity-checking a quote, not a quote.

Run it with your own numbers

Why Arizona’s payback lands where it does

Arizona’s residential electricity averaged 15.4 cents per kilowatt-hour this July, almost unchanged from 15.34 cents a year ago and landing at rank 32 out of fifty — mid-table for a state famous for its sun. That sun is exactly why the payback still lands around 16.9 years despite the modest rate: yield here runs to 1,685 kilowatt-hours per installed kilowatt, among the highest in the country, so panels simply produce more for every dollar spent. Arizona Public Service, the state’s largest utility at over 1.25 million residential customers, charges 16.5 cents, noticeably above the statewide average, while Salt River Project’s territory runs cheaper at 13.5 cents — a real difference depending on which utility serves your address. Arizona runs net billing rather than full retail, though, so exported power is paid well below the retail rate, meaning the strong yield pays off mainly through self-consumption rather than through credited exports.

Electric utilities in Arizona

The state average hides real spreads between utilities. The largest residential utilities EIA-861 lists for Arizona, with each one’s own average bundled residential price (2024 — revenue ÷ sales, the audited annual figure, not this month’s tariff):

Your utility decides Arizona’s real number — the ZIP lookup finds it in three clicks; the 2024 annual utility averages above sit apart from the June-2026 monthly 15.4¢ state figure.

Arizona’s rate, the last 24 months

July 2025 → July 2026: 15.34¢ → 15.38¢. The rate tracker has every month against the US average.

An 8 kW system in Arizona, priced out

The $2.21/W used above comes from EnergySage marketplace quotes (August 2026). Those are quotes in a competitive online market, not signed contract prices.

For comparison, Lawrence Berkeley National Laboratory’s Tracking the Sun reports $3.50/W for Arizona in 2025 (n=7,823) — 1.58x higher. The two measure different things: LBNL records prices actually reported to incentive programs, including dealer-fee financing and full retail channel costs, while EnergySage reflects what a price-sensitive online shopper is quoted. The real market median is probably between them. At the LBNL price this system would cost $28,000 and take about 24.0 years to pay back, against 16.9 at the quote-based figure — treat that as the upper case.

Read that table with one caveat: $2.21/W is Arizona’s market average, and it is the input most likely to differ for you. A quote $0.50 per watt above or below the $2.21 used here moves the payback by roughly a year and a half in either direction.

How much sun Arizona actually gets

A kilowatt of panels in Arizona produces about 1,685 kWh a year on an unshaded, south-facing roof at a 20-degree pitch. Sites that swap Arizona’s 1,685 kWh for a single national average are how Arizona and Washington end up with identical paybacks despite a 1.6x real difference in output.

That figure is a five-point cluster around Phoenix. It is a state average, and in Arizona that hides a lot: Phoenix 1688, Flagstaff 1661 If you are not near Phoenix, treat the number as a starting point and run your own address through a modelling tool.

City-level figures for Arizona

We have separately modeled production for 3 Arizona cities, and they are 3% apart — Flagstaff at 1,661 kWh per kW against Tucson at 1,711. Installed cost held at $2.21/W; paybacks use each city’s own utility tariff and export treatment where we have official EIA-861 data, which is why some differ sharply from this page’s state-average model.

• Tucson — 1,711 kWh per kW, payback about 16.4 years (on its own utility’s tariff)
• Phoenix — 1,688 kWh per kW, payback about 10.7–19.0 years (on its own utility’s tariff)
• Flagstaff — 1,661 kWh per kW, payback about 16.1 years (on its own utility’s tariff)

Those are real PVGIS-NSRDB location points, not the state figure scaled by guesswork. All Arizona and other city figures .

Two adjustments matter before you apply this to your own roof:

• Shading and orientation. The 1,685 kWh figure assumes an unobstructed south-facing array. A real Arizona roof — its own azimuth and pitch, a tree or a chimney — typically produces 10-25% less; this page models 90% of the ideal, so the 12,132 kWh/year above is already derated from 13,480. A genuinely unshaded south roof can adjust upward in the calculator.
• Year-to-year weather moves output by roughly ±5% either way.

Sunshine like this comes with cooling load, and the two run in phase: the hours a Arizona array produces most are the hours central air conditioning costs the most to run , which quietly raises the share of output used on site. Charging an EV in those same daylight hours is the natural next move — the EV + TOU + whole-home calculator prices it against Arizona’s rate.

Why Arizona’s ranking is better than its price suggests

Here is the part a rate table alone will not tell you. Arizona ranks 32nd of 50 on electricity price, but 15th on what a kilowatt of panels actually earns in a year — because a kW here produces about 1,685 kWh, well above what a cloudier state manages. Sunshine moves Arizona up 17 places. Anyone ranking states purely by electricity price is understating this one. Its immediate neighbors on price are South Carolina (15.5¢) just above and South Dakota (15.4¢) just below.

Oregon is Arizona’s closest comparable-rate analogue — 16.0¢/kWh, roughly 1,075 kWh per kW, and a payback within about a year of this one (16.4 vs 16.9 years). If you find Arizona quotes hard to sanity-check, Oregon numbers are broadly transferable.

Net billing: the rule that decides solar in Arizona

Arizona does not credit exports at the retail rate — this is net billing , not net metering. The program is Resource Comparison Proxy (RCP), in force since 2016, and it credits surplus power at an assumed 4.6¢/kWh, about 30% of retail, because no per-kWh figure is published — against a retail rate of 15.4¢.

Because a typical Arizona home uses only about 40% of its generation as it is produced, most of what the panels make is sold at 4.6¢. That is why the payback above is 16.9 years rather than the 9.4 years the same hardware would return under full-retail net metering. Raising self-consumption — a battery (worth its own arithmetic: is a home battery worth it? ), an EV charged in daylight, daytime occupancy — is the lever that closes the gap. Whether a Arizona buyer should own a battery or take a lease/TPO deal is priced in the battery buy vs. TPO calculator .

RCP steps down on an annual cycle each 1 October. APS’s own rate was not confirmed from a primary source.

One limit worth knowing: this reflects investor-owned, state-regulated utilities; Arizona’s municipal utilities and co-ops are exempt in most cases and set their own terms.

Arizona’s own solar tax credit, and what else is left

The 30% federal credit ended for systems completed after December 31, 2025, so it is $0 here as everywhere. What remains is state, utility and local — and it varies far more than the federal rule ever did.

Credit for Solar Energy Devices (Form 310) — 25% of system cost, capped at $1,000. Capped at $1,000 lifetime cumulative, not per system. No sunset. Five-year carryforward. On the $17,680 system modeled above that is worth up to $1,000. The paperwork side of claiming it is walked through in our solar tax season checklist .

Tax exemptions

Sales tax is exempt on the equipment, which reduces the upfront cost.

Property tax is fully exempt on the added value, so the system does not raise your assessment.

How Arizona’s package stacks up against the other states’ credits, rebates and exemptions is laid out on the solar incentives hub .

Is solar worth it in Arizona at 15.4¢/kWh?

Arizona is the interesting kind of case: an unremarkable 15.4¢ rate rescued by genuinely strong sun. At about 1,685 kWh per kW — well above the national planning figure — output volume compensates for what each unit is worth.

At a horizon that long, owning the roof is not the only route to cheaper power. Community solar versus rooftop walks through the subscription alternative — no roof, no loan, and no 16.9-year wait — which is worth reading before committing capital in a market like Arizona’s.

Two numbers put that in context. At Arizona’s rate, the electricity an 8 kW system would produce is worth about $1,082 a year, so the system costs roughly 16.3 years of that output to buy outright — a simple division, before costs. The headline 16.9-year figure above is the full model: it additionally counts 2.5%/yr rate inflation, $150/yr of running costs and one inverter replacement, which is why the two differ slightly. And doing nothing is not free: 25 years of that same electricity, with rates rising at 2.5% a year, comes to about $63,738.

For a 15-year payback in Arizona — given its sunshine rather than a national average — the electricity rate would need to be about 10.2¢/kWh. Arizona is at 15.4¢, which is comfortably above that line.

Sources and method

• Electricity rate: U.S. Energy Information Administration, average price by state — EIA Table 5.6.A, July 2026 data (released Sep 2026). Rate shown is Arizona’s residential average.
• Production: PVGIS v5.2 with the PVGIS-NSRDB radiation database, 1,685 kWh/kW for a five-point cluster around Arizona’s largest metro, then the 90% real-roof factor; the assumptions, the ERA5 cross-check and the attribution are on the methodology page .
• Incentives: DSIRE — Database of State Incentives for Renewables & Efficiency, NC Clean Energy Technology Center. Verify current amounts and fund status before relying on them.
• Federal credit status: IRS, Residential Clean Energy Credit . See our 2026 energy tax credit guide .
• Payback model: shared with the solar savings calculator — 2.5%/yr utility inflation, 0.5%/yr degradation, federal credit $0.

Arizona’s rate (15.4¢, EIA Table 5.6.A, July 2026 data (released Sep 2026)), export regime, production factor, installed cost and programs were last verified on 25 September 2026; Arizona’s export credit resets on its tariff cycle and incentive budgets run out mid-year, so confirm current terms before acting. Not tax or financial advice.

Frequently asked questions

How we calculated this

Worked for Arizona: 8 kW × 1,000 × $2.21/W = $17,680 gross (federal credit $0, so net before state incentives); 12,132 kWh a year × the blended kWh value at 15.4¢ retail and 4.6¢ export ≈ $1,082 year-1 saving; payback ≈ $17,680 ÷ $1,082 = 16.9 years with 2.5%/yr rate growth, 0.5%/yr degradation and one inverter replacement in the 25-year model.

Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.

States with a comparable tariff picture

• Why is my electric bill so high? — Splits a bill jump into weather, rate and usage — with Arizona’s own EIA rate history built in.
• Time-of-use rate simulator — Arizona Public Service’s TOU-E — Time-of-Use 4pm-7pm Weekdays schedule is preset from its own tariff sheet — see whether off-peak pricing beats your flat rate.
• Electricity rate tracker — Arizona’s last 24 months of EIA rates, charted against the US average.
• Find your rate by ZIP — Arizona averages hide utility gaps — look yours up from EIA-861 in three clicks.
• Net metering by state (2026 table) — Every state’s export regime with program, date and source — the rule behind Arizona’s payback.
• Solar panel cost in South Carolina — Same export regime at 15.5¢/kWh and a 22.6-year payback — the closest tariff comparison to Arizona.
• Solar panel cost in Kansas — Same export regime at 15.3¢/kWh and a 22.1-year payback — the closest tariff comparison to Arizona.
• Solar panel cost in North Carolina — Same export regime at 15.2¢/kWh and a 21.4-year payback — the closest tariff comparison to Arizona.